There's More To Vision Than Meets The Eye: Visual Agnosia

When
November 11, 2024
12:00 PM - 1:00 PM
Location
2100 E 71st Street Indianapolis, IN 46220
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Speaker: Robert Yee MD --- Merrill Grayson Professor and Chair of Ophthalmology, IU School of Medicine - Emeritus (Email: ryee@iu.edu) (Sponsored By: Robert Yee MD)(ID: 1915)

The human eye and brain's visual system do not function like a camera, as is commonly believed. In the retina, viewed images stimulate light-sensitive cells (rods and cones) and help brain cells in the first parts of visual system to break down the seen image into light/dark contrasts at different spatial frequencies, and detect edges and orientation of lines. Beyond these basic visual brain regions, other higher-order areas respond to motion, color, faces, objects and text/numbers. Injury to these latter areas, from strokes, infections or dementia, produce selective deficits (visual agnosias) for identifying and detecting particular image features - such as not being able to perceive or recognize faces (prosopagnosia). The many different types of visual agnosias demonstrate the intricate and complex arrangement of brain functions in the so-called "association areas" of the visual system.

The Scientech Club provides a forum for weekly presentations and discussions in science, technology, and other topics. The Club meets most Mondays at the Northside Events Center and Social Club (2100 E. 71st Street, Indianapolis, IN 46220.